From that post, Alastair Gibbs of TPG DisableAids Ltd kindly sent me information of a part-solution. The Minivator sling loop converter set (pictured top - code MVS174) threads through the loops of Oxford compatible slings, enabling use on Arjo style 'clip' carry bar or tilting frame hoists. They come as a set of four and retail at £19.80 + VAT + £3.95 p&p.

I've been told by someone in the know that the ratio of hoists out in public use are around 90% Oxford style to 10% Arjo. I suggest that Arjo would be doing the right thing by phasing out their system with a dual-hook up method. Wish they'd consider that a "reasonable adjustment" for the overall benefits it would bring.